First International Conference on MOLDAVIAN RISKS – FROM ...
First International Conference on MOLDAVIAN RISKS – FROM ... First International Conference on MOLDAVIAN RISKS – FROM ...
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<str<strong>on</strong>g>First</str<strong>on</strong>g> <str<strong>on</strong>g>Internati<strong>on</strong>al</str<strong>on</strong>g> <str<strong>on</strong>g>C<strong>on</strong>ference</str<strong>on</strong>g> <strong>on</strong> <strong>MOLDAVIAN</strong> <strong>RISKS</strong> - <strong>FROM</strong> GLOBAL TO LOCAL SCALE<br />
16-19 May 2012, Bacau, Romania<br />
WATER INDUCED GEOHAZARDS MEASURED WITH<br />
SPACEBORNE INTERFEROMETRY TECHNIQUES<br />
F. Serban 1 , M. Radu 2 , D. Teleaga 1 , M. Sorin 3<br />
1 Advanced Studies and Research Center, Bucharest<br />
2 CONVERSMIN, Bucharest<br />
3 INCDMRR, Bucharest<br />
Corresp<strong>on</strong>ding author: F. Serban, florin.serban@asrc.ro<br />
Abstract: Spaceborne interferometry techniques combined with ground data permit<br />
estimati<strong>on</strong> of the rocks mechanical properties and the development of models and<br />
scenarios to predict disaster events such as cave-ins, landslides or soil liquefacti<strong>on</strong> in the<br />
case of an earthquake. The DInSAR (Differential Interferometric Synthetic Aperture<br />
Radar), Interferograms Stacking and PSI (Persistent Scatterers Interferometry) techniques<br />
have been applied to retrieve the displacement informati<strong>on</strong> as accurate as possible <strong>on</strong> three<br />
sites in Romania, which suffer of ground instability caused by the water comp<strong>on</strong>ent. The<br />
first site is composed of 4 tailing retenti<strong>on</strong> p<strong>on</strong>ds at different stages of their life located in<br />
Bucovina. The tailing p<strong>on</strong>ds are hydrotechnical structures of permeable type designed for<br />
the safe deposit of mining detritus byproducts and disposal of the water c<strong>on</strong>tained in these<br />
byproducts. Since 1998 some 550 mines have been closed and introduced in a c<strong>on</strong>servati<strong>on</strong><br />
process all over the country. In order to prevent ecological and human damages, all these<br />
mines and storage p<strong>on</strong>ds for mining tailings are required to be under c<strong>on</strong>tinuous<br />
m<strong>on</strong>itoring. Using 15 high-resoluti<strong>on</strong> Spotlight TerraSAR-X images, the stability of the<br />
storage p<strong>on</strong>d was m<strong>on</strong>itored over a five-m<strong>on</strong>th period during 2011. Interferometric<br />
stacking and PSI were applied in order to generate deformati<strong>on</strong> maps and deformati<strong>on</strong><br />
profiles. At the same time, GPS measurements and Electrical Tomography for water<br />
c<strong>on</strong>tent were used as independent measurements. The sec<strong>on</strong>d site is Ocnele Mari brine<br />
extracti<strong>on</strong> area. The extracti<strong>on</strong> of salt through dissoluti<strong>on</strong> led to slow ground subsidence<br />
but the flooding and dissoluti<strong>on</strong> of the Roman caves led to catastrophic cave-ins and the<br />
relocati<strong>on</strong> of an entire village. The ground deformati<strong>on</strong> is presently measured with leveling<br />
instrumentati<strong>on</strong> and steps are being made to adopt the interferometric results for a better<br />
spatial and temporal coverage that should refine the existing measurement model. The<br />
third site is the City of Bucharest. Using ERS data collected over 7 years, ground<br />
instability was detected <strong>on</strong> a large area that represents the historical watershed of the<br />
Dambovita river. A network of water wells shows that the ground instability is directly<br />
proporti<strong>on</strong>al to the groundwater depth. The sites that were analyzed and presented reveal<br />
important informati<strong>on</strong> which can also benefit some other risk areas in Moldova, such as<br />
mining sites (Targu Ocna, Cacica) and urban areas.<br />
Key words: spaceborne interferometry, DInSAR, PSI, ground instability.<br />
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